Farrah Abraham'Backdoor Teen Mom' Porn Krushes Kim K Sex Tape

5/7/2013 1:05 AM PDT

Farrah Abraham is a backdoor crowd pleaser for sure ... because there was such intense, pent-up interest in her porn video, it crashed Vivid's site.

According to our porn sources ... Farrah's 70-minute debut, "Backdoor Teen Mom," lured in more than 2 million visitors in just 12 hours Monday ... annihilating the record previously held by Kim K and Ray J -- which attracted 600,000 during the same time frame.

Farrah swamped Vivid's servers so hard ... the site went down Monday morning for 9 minutes ... which is more than enough time to satisfy most of the buyers -- trust us ...

Vivid honchos tell us they were able to access additional servers to handle, as they put it, "the immense load."